US20060048284A1 - Shell for ballistic helmet - Google Patents

Shell for ballistic helmet Download PDF

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Publication number
US20060048284A1
US20060048284A1 US10/529,557 US52955705A US2006048284A1 US 20060048284 A1 US20060048284 A1 US 20060048284A1 US 52955705 A US52955705 A US 52955705A US 2006048284 A1 US2006048284 A1 US 2006048284A1
Authority
US
United States
Prior art keywords
shell
layers
less
areal density
paraaramide
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US10/529,557
Inventor
Yoav Kapah
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RABINTEX INDUSTRIES Ltd
Original Assignee
RABINTEX INDUSTRIES Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by RABINTEX INDUSTRIES Ltd filed Critical RABINTEX INDUSTRIES Ltd
Assigned to RABINTEX INDUSTRIES LTD. reassignment RABINTEX INDUSTRIES LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KAPAH, YOAV
Publication of US20060048284A1 publication Critical patent/US20060048284A1/en
Priority to US12/289,431 priority Critical patent/US20090061186A1/en
Abandoned legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A42—HEADWEAR
    • A42B—HATS; HEAD COVERINGS
    • A42B3/00—Helmets; Helmet covers ; Other protective head coverings
    • A42B3/04—Parts, details or accessories of helmets
    • A42B3/06—Impact-absorbing shells, e.g. of crash helmets
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41H—ARMOUR; ARMOURED TURRETS; ARMOURED OR ARMED VEHICLES; MEANS OF ATTACK OR DEFENCE, e.g. CAMOUFLAGE, IN GENERAL
    • F41H5/00—Armour; Armour plates
    • F41H5/02—Plate construction
    • F41H5/04—Plate construction composed of more than one layer
    • F41H5/0471—Layered armour containing fibre- or fabric-reinforced layers
    • F41H5/0485—Layered armour containing fibre- or fabric-reinforced layers all the layers being only fibre- or fabric-reinforced layers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
    • Y10T156/10—Methods of surface bonding and/or assembly therefor
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24942—Structurally defined web or sheet [e.g., overall dimension, etc.] including components having same physical characteristic in differing degree
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/249921—Web or sheet containing structurally defined element or component

Definitions

  • This invention relates to shells for ballistic helmets, and more particularly to helmet shells made of paraaramide fabrics such as Kevlar®, protecting from bullets and fragments.
  • a shell for ballistic helmet is supposed to stop incident shrapnel fragments or bullets, thereby protecting the head of the user.
  • the aim of shell design and manufacture is to obtain a shell providing required ballistic protection at minimal weight.
  • the weight of the shell is of great importance because the helmet user carries it for long periods of time, and the lighter the helmet, the more it is convenient in use.
  • the ballistic protection of the helmet is normally tested by the so-called V50 test, 17 grain, according to known US and European standards.
  • the test measures the velocity at which 50% of fragments pierce the helmet while 50% are retained.
  • An average areal density of the shell material is the weight of the shell divided by its area.
  • the ratio between the level of ballistic protection and the areal density is the decisive parameter determining the helmet quality, and in general if it is higher, then the helmet is better. This ratio is called protection coefficient:
  • An additional parameter is the thickness of the shell. The smaller the thickness, the less awkward is the helmet and more convenient it is in usage.
  • One of the most common technologies for production of ballistic helmet shells is pressure forming of the shells in a mold, from a stack of paraaramide fabric blanks with bonding resin.
  • the manufacturers are known to use up to 16-24 layers of fabric with 220 to 300 g/m 2 areal density, and bonding resin in about 14-20% of the total shell weight.
  • the stack of blanks soaked with resin is pressed in a mold at about 30-40 Kg/cm 2 pressure at temperature suitable for the resin polymerization.
  • the obtained shells have more than 8-9 Kg/m 2 areal density, 7.5-9 mm thickness, and the shell weight is not less than 0.850 Kg.
  • a shell for ballistic helmet formed from a plurality of paraaramide fabric layers and bonding resin.
  • the fabric layers have areal density less than 200 g/m 2 , the shell has average thickness less than 6.5 mm and average areal density less than 7.5 Kg/m 2 .
  • part of the fabric layers have areal density less than 160 g/m 2
  • the rest fabric layers have areal density between 200 and 160 g/m 2 .
  • the number of paraaramide layers should be greater than 28, preferably not less than 33, more preferably 38 and more, at least part of the layers having areal density not exceeding 160 g/m 2 .
  • the bonding resin constitutes less than 12% of the shell weight.
  • the present invention is based on a surprising discovery of the inventors that, if in a shell for a ballistic helmet formed from a plurality of paraaramide fabric layers and bonding resin, considerably greater number of layers is used than that known heretofore with a lower areal density (weight) of the layers than that typically used in the practice, the shell yields the required ballistic protection at lighter weight than conventional helmet shells, or better ballistic protection with the same shell weight. Another contributing factor is the usage of layers with different areal density.
  • a method for the production of shells for ballistic helmets from a plurality of layers as described above including pressing and bonding the plurality of layers at pressure equal to or above 150 Kg/cm 2 , preferably above 300 Kg/cm 2 .
  • composition and method of production according to the present invention provide for lighter helmets with better ballistic protection qualities.
  • One example of the material used for the production of a shell according to the present invention is a material made of 38-40 layers of KEVLAR®-KM2 and/or other paraaramide fabric having areal density respectively 155 g/m 2 and 195 g/m 2 and bound by bonding resin of about 10-12% of the shell weight.
  • the KEVLAR®-KM2 fabric is used mainly in the external layers of the shell.
  • the above shell structure is manufactured by pressing the stack of blanks to 6 mm thickness using pressures of 150 to 300 Kg/cm 2 .
  • the area of the shell is about 0.1 m 2 .

Abstract

A shell for ballistic helmet formed from a plurality of paraaramide fabric layers such as KEVLAR-KM2®, and bonding resin. All fabric layers have areal density less than 200 g/m2, preferably part of them have areal density less than 160 g/m2. The number of paraaramide layers is greater than 28, preferably 38 and more. The bonding resin constitutes less than 12% of the shell weight. The shell has average thickness less than 6.5 mm and average areal density less than 7.5 Kg/m2. A method for the production of such shells includes pressing and bonding the plurality of layers at pressure equal to or above 150 Kg/cm2, preferably above 300 Kg/cm2.

Description

    FIELD OF THE INVENTION
  • This invention relates to shells for ballistic helmets, and more particularly to helmet shells made of paraaramide fabrics such as Kevlar®, protecting from bullets and fragments.
    • BACKGROUND OF THE INVENTION
  • A shell for ballistic helmet is supposed to stop incident shrapnel fragments or bullets, thereby protecting the head of the user. The aim of shell design and manufacture is to obtain a shell providing required ballistic protection at minimal weight. The weight of the shell is of great importance because the helmet user carries it for long periods of time, and the lighter the helmet, the more it is convenient in use.
  • The ballistic protection of the helmet is normally tested by the so-called V50 test, 17 grain, according to known US and European standards. The test measures the velocity at which 50% of fragments pierce the helmet while 50% are retained. An average areal density of the shell material is the weight of the shell divided by its area. The ratio between the level of ballistic protection and the areal density is the decisive parameter determining the helmet quality, and in general if it is higher, then the helmet is better. This ratio is called protection coefficient:
      • Protection coefficient=V50/areal density
  • An additional parameter is the thickness of the shell. The smaller the thickness, the less awkward is the helmet and more convenient it is in usage.
  • One of the most common technologies for production of ballistic helmet shells is pressure forming of the shells in a mold, from a stack of paraaramide fabric blanks with bonding resin. The manufacturers are known to use up to 16-24 layers of fabric with 220 to 300 g/m2 areal density, and bonding resin in about 14-20% of the total shell weight. The stack of blanks soaked with resin is pressed in a mold at about 30-40 Kg/cm2 pressure at temperature suitable for the resin polymerization. The obtained shells have more than 8-9 Kg/m2 areal density, 7.5-9 mm thickness, and the shell weight is not less than 0.850 Kg.
    • SUMMARY OF THE INVENTION
  • In accordance with the present invention, there is provided a shell for ballistic helmet formed from a plurality of paraaramide fabric layers and bonding resin. The fabric layers have areal density less than 200 g/m2, the shell has average thickness less than 6.5 mm and average areal density less than 7.5 Kg/m2. Preferably, part of the fabric layers have areal density less than 160 g/m2, while the rest fabric layers have areal density between 200 and 160 g/m2. The number of paraaramide layers should be greater than 28, preferably not less than 33, more preferably 38 and more, at least part of the layers having areal density not exceeding 160 g/m2.
  • Preferably, the bonding resin constitutes less than 12% of the shell weight.
  • The present invention is based on a surprising discovery of the inventors that, if in a shell for a ballistic helmet formed from a plurality of paraaramide fabric layers and bonding resin, considerably greater number of layers is used than that known heretofore with a lower areal density (weight) of the layers than that typically used in the practice, the shell yields the required ballistic protection at lighter weight than conventional helmet shells, or better ballistic protection with the same shell weight. Another contributing factor is the usage of layers with different areal density.
  • According to another aspect of the present invention, there is provided a method for the production of shells for ballistic helmets from a plurality of layers as described above, the method including pressing and bonding the plurality of layers at pressure equal to or above 150 Kg/cm2, preferably above 300 Kg/cm2.
  • The composition and method of production according to the present invention provide for lighter helmets with better ballistic protection qualities. For example, a shell with less than 0.7 Kg weight and level of protection higher than V50=2000 ft/sec can be manufactured.
    • DETAILED DESCRIPTION OF THE INVENTION
  • One example of the material used for the production of a shell according to the present invention is a material made of 38-40 layers of KEVLAR®-KM2 and/or other paraaramide fabric having areal density respectively 155 g/m2 and 195 g/m2 and bound by bonding resin of about 10-12% of the shell weight. The KEVLAR®-KM2 fabric is used mainly in the external layers of the shell.
  • The above shell structure is manufactured by pressing the stack of blanks to 6 mm thickness using pressures of 150 to 300 Kg/cm2.
  • A prototype ballistic helmet shell with the inventive structure, manufactured by the above method weights 0.7 Kg and provides for level of protection V50=2000 ft/sec. The area of the shell is about 0.1 m2. The average areal density of the shell is 0.7/0.1=7 Kg/m2, and the protection coefficient is 2000/7=286.

Claims (14)

1. Shell for ballistic helmet formed from a plurality of paraaramide fabric layers and bonding resin, wherein said fabric layers have areal density equal or less than 200 g/m2, said shell has average thickness less than 6.5 mm and average areal density less than 7.5 Kg/m2.
2. Shell according to claim 1, wherein at least one of said fabric layers has areal density less than 160 g/m2.
3. Shell according to claim 1, wherein part of said fabric layers have areal density less than 160 g/m2 and the rest fabric layers have areal density between 200 and 160 g/m2.
4. Shell according to claim 2, wherein part of said paraaramide fabric layers are KEVLAR-KM2®.
5. Shell according to claim 1, wherein said bonding resin constitutes less than 12% of the shell weight.
6. Shell according to claim 1, wherein said plurality of layers is greater than 28.
7. Shell according to claim 6, wherein said plurality of layers is not less than 33.
8. Shell according to claim 7, wherein said plurality of layers is not less than 38.
9. Shell for ballistic helmet formed from a plurality of paraaramide fabric layers and bonding resin, wherein said plurality of layers is greater than 28 and said shell has average thickness less than 6.5 mm.
10. Shell for ballistic helmet formed from a plurality of paraaramide fabric layers and bonding resin, wherein said plurality of layers is not less than 38.
11. Shell for ballistic helmet formed from a plurality of paraaramide fabric layers and bonding resin, wherein said fabric layers have areal density less than 200 g/m2, and said plurality of layers is greater than 28.
12. Shell for ballistic helmet formed from a plurality of paraaramide fabric layers and bonding resin, wherein said plurality of layers is greater than 28 and said shell has average areal density less than 7.0 Kg/m2.
13. Method for production of shell for ballistic helmet according to anyone of the preceding claims, including pressing and bonding of said plurality of layers at pressure equal or above 150 Kg/cm2.
14. Method according to claim 12, wherein said pressure is equal or above 300 Kg/cm2.
US10/529,557 2002-09-30 2003-09-30 Shell for ballistic helmet Abandoned US20060048284A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/289,431 US20090061186A1 (en) 2002-09-30 2008-10-28 Shell for ballistic helmet

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IL152006 2002-09-30
IL15200602A IL152006A0 (en) 2002-09-30 2002-09-30 Shell for ballistic helmet
PCT/IL2003/000782 WO2004029538A1 (en) 2002-09-30 2003-09-30 Shell for ballistic helmet

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US12/289,431 Continuation US20090061186A1 (en) 2002-09-30 2008-10-28 Shell for ballistic helmet

Publications (1)

Publication Number Publication Date
US20060048284A1 true US20060048284A1 (en) 2006-03-09

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Family Applications (2)

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US10/529,557 Abandoned US20060048284A1 (en) 2002-09-30 2003-09-30 Shell for ballistic helmet
US12/289,431 Abandoned US20090061186A1 (en) 2002-09-30 2008-10-28 Shell for ballistic helmet

Family Applications After (1)

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US12/289,431 Abandoned US20090061186A1 (en) 2002-09-30 2008-10-28 Shell for ballistic helmet

Country Status (4)

Country Link
US (2) US20060048284A1 (en)
AU (1) AU2003269436A1 (en)
IL (1) IL152006A0 (en)
WO (1) WO2004029538A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080141428A1 (en) * 2004-06-03 2008-06-19 Yoav Kapah Cooling System for Body Armour
WO2008101138A1 (en) * 2007-02-15 2008-08-21 Honeywell International Inc. Protective helmets
US20120047635A1 (en) * 2009-02-13 2012-03-01 Kuji Sports Ltd Deformable safety helmet
US10081159B2 (en) * 2014-12-05 2018-09-25 Honeywell International Inc. Materials gradient within armor for balancing the ballistic performance
WO2023141453A1 (en) * 2022-01-19 2023-07-27 Gentex Corporation Coating and composite materials for enhancing ballistic protection

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1750921B1 (en) * 2005-02-04 2008-07-30 Egon Busch Method for producing a ballistic protective armour
FR2991909B1 (en) * 2012-06-19 2014-07-04 Thales Sa HETEROSTRUCTURE IN COMPOSITE MATERIAL
ES1088508Y (en) * 2013-05-13 2013-11-25 Fedur Sa ANTIFRAGMENT AND ANTIBALA HELMET

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4916000A (en) * 1987-07-13 1990-04-10 Allied-Signal Inc. Ballistic-resistant composite article
US6012178A (en) * 1995-04-08 2000-01-11 Akzo Nobel Nv Antiballistic protective helmet
US20030009530A1 (en) * 2000-11-08 2003-01-09 Laurent Philonenko Instant message presence protocol for facilitating communication center activity
US20030177184A1 (en) * 2002-03-14 2003-09-18 Dickerman Howard J. Instant messaging session invite for arranging peer-to-peer communication between applications
US6654871B1 (en) * 1999-11-09 2003-11-25 Motorola, Inc. Device and a method for performing stack operations in a processing system
US20040062383A1 (en) * 2002-10-01 2004-04-01 Nortel Networks Limited Presence information for telephony users
US6993327B2 (en) * 2001-10-29 2006-01-31 Motorola, Inc. Multicast distribution of presence information for an instant messaging system

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IL143770A0 (en) * 1999-01-18 2002-04-21 Twaron Products Gmbh Penetration-resistant material comprising fabric with high linear density ratio of two sets of threads
AU2002227028A1 (en) * 2000-11-28 2002-06-11 3Tex, Inc. Contour rigid composite structure and method
ATE337539T1 (en) * 2001-03-15 2006-09-15 Teijin Twaron Gmbh PENETRATION RESISTANT MATERIAL WITH A FABRIC WITH A HIGH LINEAR DENSITY RATIO BETWEEN TWO GROUPS OF YARN

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4916000A (en) * 1987-07-13 1990-04-10 Allied-Signal Inc. Ballistic-resistant composite article
US6012178A (en) * 1995-04-08 2000-01-11 Akzo Nobel Nv Antiballistic protective helmet
US6654871B1 (en) * 1999-11-09 2003-11-25 Motorola, Inc. Device and a method for performing stack operations in a processing system
US20030009530A1 (en) * 2000-11-08 2003-01-09 Laurent Philonenko Instant message presence protocol for facilitating communication center activity
US6993327B2 (en) * 2001-10-29 2006-01-31 Motorola, Inc. Multicast distribution of presence information for an instant messaging system
US20030177184A1 (en) * 2002-03-14 2003-09-18 Dickerman Howard J. Instant messaging session invite for arranging peer-to-peer communication between applications
US20040062383A1 (en) * 2002-10-01 2004-04-01 Nortel Networks Limited Presence information for telephony users

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080141428A1 (en) * 2004-06-03 2008-06-19 Yoav Kapah Cooling System for Body Armour
WO2008101138A1 (en) * 2007-02-15 2008-08-21 Honeywell International Inc. Protective helmets
US9631898B2 (en) 2007-02-15 2017-04-25 Honeywell International Inc. Protective helmets
US20120047635A1 (en) * 2009-02-13 2012-03-01 Kuji Sports Ltd Deformable safety helmet
US8850622B2 (en) * 2009-02-13 2014-10-07 Kuji Sports Ltd. Deformable safety helmet
US10081159B2 (en) * 2014-12-05 2018-09-25 Honeywell International Inc. Materials gradient within armor for balancing the ballistic performance
WO2023141453A1 (en) * 2022-01-19 2023-07-27 Gentex Corporation Coating and composite materials for enhancing ballistic protection

Also Published As

Publication number Publication date
IL152006A0 (en) 2003-07-31
WO2004029538A1 (en) 2004-04-08
AU2003269436A1 (en) 2004-04-19
US20090061186A1 (en) 2009-03-05

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Legal Events

Date Code Title Description
AS Assignment

Owner name: RABINTEX INDUSTRIES LTD., ISRAEL

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KAPAH, YOAV;REEL/FRAME:017180/0506

Effective date: 20050329

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION